Q50 slow off the line but OK after 15 MPH

Gear /
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Hi. Got a 1985 Yamaha QT50 that is slow off the line. From 0 to about 15 MPH. Then after 15 MPH it shows good power to about topping off around 27 MPH.

Question 1: What could be some reasons why it is slow off the line, but good after hitting about 15 MPH?

Question 2: Any simple things to make it actually do 30 MPH or more?

Question 3: The NGK BP4HS spark plug is impossible to find. Any recommendations on a more popular brand and model?

Question 4: Would a new ignition coil help?

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